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Approximate Full Adders for Energy Efficient Image Processing Applications
Journal of Circuits, Systems and Computers ( IF 1.5 ) Pub Date : 2021-04-14 , DOI: 10.1142/s0218126621502352
M. C. Parameshwara 1
Affiliation  

This paper proposes six novel approximate 1-bit full adders (AFAs) for inexact computing. The six novel AFAs namely AFA1, AFA2, AFA3, AFA4, AFA5, and AFA6 are derived from state-of-the-art exact 1-bit full adder (EFA) architectures. The performance of these AFAs is compared with reported AFAs (RAAs) in terms of design metrics (DMs) and peak-signal-to-noise-ratio (PSNR). The DMs under consideration are power, delay, power-delay-product (PDP), energy-delay-product (EDP), and area. For a fair comparison, the EFAs and proposed AFAs along with RAAs are described in Verilog, simulated, and synthesized using Cadences’ RC tool, using generic 180 nm standard cell library. The unconstrained synthesis results show that: among all the proposed AFAs, the AFA1 and AFA2 are found to be energy-efficient adders with high PSNR. The AFA1 has a total power=1.722μW, delay=213ps, PDP=0.3668fJ, EDP=78.1285×1027Js, area=36.59μm2, and PSNR=26.4292dB. And the AFA2 has the total power=1.924μW, delay=215ps, PDP=0.4136fJ, EDP=88.924×1027Js, area=33.264μm2, and PSNR=26.4292dB.

中文翻译:

用于节能图像处理应用的近似全加器

本文提出了六种新颖的近似 1 位全加器 (AFA),用于不精确计算。六种新颖的 AFA 即 AFA1、AFA2、AFA3、AFA4、AFA5 和 AFA6 源自最先进的精确 1 位全加器 (EFA) 架构。这些 AFA 的性能在设计指标 (DM) 和峰值信噪比 (PSNR) 方面与报告的 AFA (RAA) 进行了比较。正在考虑的 DM 是功率、延迟、功率延迟积 (PDP)、能量延迟积 (EDP) 和面积。为了公平比较,使用通用 180 nm 标准单元库,使用 Cadences 的 RC 工具对 EFA 和提议的 AFA 以及 RAA 进行了描述、模拟和合成。无约束综合结果表明:在所有提出的 AFA 中,发现 AFA1 和 AFA2 是具有高 PSNR 的节能加法器。AFA1 共有力量=1.722μW,延迟=213ps,等离子显示器=0.3668缩略词,电子数据处理=78.1285×10-27JS,区域=36.59μm 2信噪比=26.4292D b。而AFA2共有力量=1.924μW,延迟=215ps,等离子显示器=0.4136缩略词,电子数据处理=88.924×10-27JS,区域=33.264μm 2信噪比=26.4292D b。
更新日期:2021-04-14
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